Guabd mechanism



Nov. 22, 1927. 1650134 l AQ E. KINTNER GUARD MECHANI SM 3 Sheets-Sheet lMya/V701? 52. @y @ai Nov. z2, 1927. 1,650,134

A. E. KINTNER GUARD MECHANISM Filed Oct.3, 1 3 Sheets-Sheet 2 Nov. 22,1927.

A. E. KINTNER GUARD"A MEGHANISM 3 SheetsZ-fheet 3 2 y im@ Patented Nov.22, 1927.

n, y 1,650,134 UNiTEDfSTArEs .PATENroFFica f Y ALCIN n.xinrnnn, orrAiNrisvrLiinQoHro.

GUARD MEcHANIsii/r.

Application filed October 3,'1922. Serial No. 592,160.

rlhis invention relates to mechanism for guarding or protecting openingsin buildings, .or places of possible entry, such as windows, `doors and'passagewaya by unauthorized persons.

s One object of the invention is toprovide a guard mechanism ofrelatively simple construction.

Another object of the-invention is toprovide a guarding yor protectingmechanism having relatively movable yelements which arey capable of.beingpositi-oned to protect or guard `an opening, or nested relativel toeachother to permit unobstructed use o the opening. f n

Another object of the'invention is to provide in kmechanismV ofk thischaracter improv-ed means for supporting and moving kthe protecting orguarding elements, whereby they. may be readily moved from theiroperative position to their inoperative posi tion, and vice versa.y s

Other objects of th-e invention will be apparent 'to those skilled inthe art to which my invention relates from the following descriptiontaken in connection with theaccompanying drawings, wherein Fig. 1 is ankelevation of a window frame and window and a guard mechanism emi?bodying my invention associated therewith.k is a section on the line2-20fl Fig. 2 Fig. 1.

F ig. 3 is an lelevation showing the guard mechanism in operatedposition-that is,

' moved into position to guard-the window andprevent entry therethrough,parts being broken away to facilitate the illustration.

Fig. 4 is a s-ection on the line 4--4 of Fig. 3. f

Fig. 5 isa section onthe line 5 5 of VFig. 3.

Figs. 6 and 7 are fragmentary side' eleva tional views'illustratingdetails of construc tion.

Inthe drawings, 1 indicates a frame forming` an opening 2 which is to beprotected or guarded. The frame 1 constitutes the frame for a window,this being shown as the preferred application of my` invention. It willhowever be understood that the guard mechanism, later to be described,is primari-` yly lto be yintended to protect or guard an opening toprevent .the entryV therethrough of unauthorized persons, it beingimmaterial so far as the: present inventionk 1s concerned and incarrying out its purpose whether the `with it a 'closingidevice such as'a door or a window sash or sashes. The frame 1 is preferably providedvwith guiding devices 3, e, 4', forming guid-es in different verticalplanes to accommodate sliding window sashes 5,6. f "l 7 indicates anauxiliary frame arranged to, be permanently fixed within the frame 1 inany suitable mannenpref-erably on the outer. side of the sashes 5, 6.The auxiliary frame 7 may be incorporated with the frame 1 whenassembledor appliedthereto after it is complet-ed and utilized in abuilding structure A. The auxiliary frame 7 serves to covercertain'elements of the guard mechanism, indicated as an entirety at 8,in such manner that the latter cannot be tampered with at any time.Where the auxiliary frame y7 is applied to the frame 1 subsequent to itskcompletion or assembly in abuilding structure,it is preferablyconstructed to support the supporting devices and guarding elements sothat the latter and the auxiliary frame maybek assembled assubstantially a unitary structure.

The auxiliary frame 7 lpreferably com- .prises a pair. of angle plates 7and upper and lower cross members 9, 10, respectively,

lconstituting the 4opening 2 toform chambers 9', 10'-, respectively, thepurpose of which will be later set forth..

Referring to the guard mechanism 8, 11, 12, indicate a pair of devicesextending along the opposite sides of the Vopening 2k and adapted tosupport a plurality of guard elements 13; By preference, the supportingf devices 11, 12, 'extend along the vertical sides of the opening V2 andthe guard elements 13 engage with the devices'11,'12, at their oppositevends and' move vertically thereon. 'lhesesupporting devices 1 1, 12 arepreferably arranged relatively close to the inner `faces of the vsidewalls 7 b, this arrangement serving to position the guard elements 13close Y,to these walls as well as the'cross members 9, 10, therebypreventing the insertion of tools betweeny the guard elements and theauxiliar frame 7. For this nur. ose ,the

opposite ends of each side wall 7":L ofthe plates 7 may be turnedinwardly as shown at 7X and suc-h ends are' formed withopen- Vthe motorshaft 21 and theshaft 17, this train, preferably; comprising a worm 21a.iixed .tothe shaft 21 and a worm gear 21b ings 14 which receive andform bearings for..

the opposite ends of the adjacent supporting devices 11 oi 12. Each ofg.the supporting;

devices 11, 12, comprises a rotatable shaft having.;(1) `a. threaded.section 15. .(extendf.;

ingl from a'pointi slightlyv abovefthealowerj edge of the lupper` crossmemberfQ to a-.point below-theupper edge of thelowercross meine` ber 10or` a. connecting plate-1()K between it andthe `adjacent:plate 7 whichifits a.. screw threaded opening 13 formed. in the..

adjacent l end of; each guardi element V13 and co-acts therewith.y andin co-operation with thescrew Athfreadsaof the` ,other supporting.ina-tic stop mechanism indicated asfan` enetiretyatc24,iasishownin'xigs; 1, Band-.6.-

AThe;l brusl-i` carrying frame 23 is; truiinioned on the armature shaft21 (as will beun#v derstood. from-Figs v3, f1 `and 6): and. one trunnionoff theafraine 23-` has connected to y 1 device and .the threadedopening at the vothen i eiidf of the. guard element, 13 Ytoipropel the."

latter, into and .out of operative position:-l as .will be; laterdescribed and (2),` aniunthreaded sectionl 15a (efrtendingdnto the`chamber 9') along which the elements 13; may uslide -when moved upwardlyby the threaded sections 15 of the shafts 11, 12,'.

wherebythey/may be :nestediii compactfrela:

tion. in. their inoperative position, as shown:

in Fig. 11. The cross member 9.is ofawidth f to accoinmodatefall of.ytlieguard yelements operativeipositioii,soA as to leave the openingl 2"formed bythe plates 7 Vmembers 9, 1.0, unobstructed.y

Figi,` 1 showsv the. guardelements; nested together in the chamber 9',To move the guard `elements into. operative position, the,V supportingdevices 11, 12, aresimultaneously r `13-vwhen theyare nested or ,movedinto-in-.f

. and .cross rotated i by adriving; 'mechanismy indicated asan,entiretyv at 16, the screw threads. on

the. devices -1l, `12, `engagingwith tliezthreads .i in the'openings.;13 of` the guard elements:

13 .and operating therethrough to-inove v.the

latter from: the chambertonpositions. bridging theopening 2, as shown.ingFig..

3. The drivingniechanisin 1'6- coinprisesfthe followinginstrumentalities: 17 indicates it aispindle25. which projects axiallyof the armature-f shafti 215i through.v an opening aldi formedfinthe.frameinember 1"and carries yat 'its outer, end; a. handle: 26,wherebywthe brush carrying frame 23 may be moved in one-direction or theotheri toeifect operation of the motor inthe desired direction. Theyhandle26 may be provided with a pointer.Y

27 which will pointto indicating characters (sc e Fig. 7) to indicatethe direction in which the handle should :be moved to operate the guardelements 13.

28 findicates devices extending between andfconiiecting eachguardelement with vthe -neXt,or succeeding element. The functionsof thedevices 28'are'to (1) co-operate with the guard elements' 13` toprotectthe opening, 2. 4or entry thereto byrestricting the spaces between. theguard elements 13 and (2); effectsinovement of the elements 13 fromtheichamben- 9" intofengagement with the screw threads 15 of thesupporting devices. 11,'.12,',in;the manner to: be later described.V

:The connecting. devices 28 preferably coinprise-pair' of links .28pivotally connected bevel gears fixcd .to the lowerigends ofither;

shafts 11, 12. 18 indicatesbevel gearsfixed to a .shaftV 17 and meshingAwith thegears 17.. `The shaft. 17n extends transverselyof. the;opening,` 2 through the chamber 10.".A

The shaft17`is supported at one. end inV a g. standard 1,9; its other`end extendsgthrough;

and supported inY an vopening` 20 formed end,permittingthe applicationof power to Vthe shaft; 17 a whereby the` shafts 11', 12, mayy .1thereof. @ne link inthe adjacentupright 1"?, such extended attheirainner.endsto each other and at'their remotes ends to the adjoiningguard elements.

13,I .thisA construction permitting the guardV elements to move relativeto each other into a nestedor compact relationship when fed upwardly bythe shafts 11, 12, into theL chamben 9.', I'. preferably providetwopairs of links/.28. betiweeni adjoining guard elements 13 and space eachpair at points substantially midway -hetween thea longitudinal center.;lineirofthe opening 2. Vand one side of each .pair may beprovidedwith'.ayprojectiirg lug 28b to'limit 3 their unfolding movementzatan'obtuse angle be rotated..` 21;;indicates an electric motor.

sired manner to the; frame..member1"l bute within the side members 1C,1C', as shown in Fig. 1. 22yindicatesa gear. train between...

(see Fig. A3);y sov that rthey .will readily fold or articulateV whenv.the supporting devices areroperated tomovetheguard elements 13upwardly. into, thel chamber 9.n

29;'indicates as; an entirety meansarranged to 'engage'.fwithficertainof the' guard;l elements Y135.when...nevsted :in the; chamber y9and*maintain-ehemal-thereinmaliemma 1,650,134;y -y ,l

taining y.m'eans29 are arranged, atta point( .Y abovelthe kplalneginfwhiehthe screw threads flfon/the supporting devices-,(111, l2, terminateanclnormally project intothe path ot y movement ot the e'lenientxlso as to'engage :element- 13. 'tondo-ye fitintoseligagelnelit.withthfegp-` screw threads 1-fl5,-t-he --Mmaintain'ing y ineajns,-29*releasesy the element andl then j arf# the lower edgesthereofixceptthelower#- lvvith the screw threads I5 until they-.-V are Wardly-y as,falready described, and it acts throughl its connection 28 4.upon thenextv reststheanextgor succeeding element 13e-and wardly into operativeposition.

. holdsit-nntil it inwturn is'gacted `u-ponfby'vthefconnect-*ng-.devices 28A betiveen it and:

` the v rpreviously` 'released element 13, This operation islrepeatedfor each guard element, 13in until allghave; been successively engagedWith the screw threadsv 15 and moved-Vdorvn-Y K'plhe :maintai'ningvmeans 29 Ipreferably comprisefpairsfot dogs BKO/.leach ofwhich may besupported at thegjlower end a Y .resilient roi/31 depending from chemember le or aplateg32-iixedthereto.. -Ae

Shown in `Ifigs2 and "5, the'dogs-BO of each E1-pairearedisposed uponopposite sides of the eleinent-sfllS-and normally project belov7 their:lower edges, ythis f'arrangement ypermitting the dogs ito ride thelguard-elements v13y wheny mOVednpWardlyl and to release them When ,actedupon by the"connecting'devices 28.y To

facilitate these' `Vl`operations,the, opposing -facefi of lthe'dogsz()are beveled as shown i .-at33 andlilikeyvisethe elements-13 have,

l 'beveledportionsin line WiththedogsBOl.

" AOt the`r automatiestoppingmeans 24, `24" f indicatesia rod extendinglongitudinally of `Tand sflidably supported on ,the outerfsurfa lWhichprojects through, an,V opening l` formed in the4 adjacentupright l? andalso #rotate them at the same rater ofjf'speed,L therea,

*by inovingorpropellingthe opposite *ends` A120 oftl1e'n-priglit"layadjacentto themotor 2l,

" preferably by t t straps 24X.

zendytherck d2tEL is providedvvith an arm: 24?

anv opening ormedrin the Wall .7@ into ythe y pathof movement of theyguard Velements .13;Y .il-Near its loiverlend, the rod. Maisie-providedwith a' a second ,l arm 24, which "projects-f through ain-opening 1Xformed j in ,thel upav kkrigliu-l-and angopeningd formed' in the Imentsl-3" areL moved-c` from the] position wall into the,path of movement,ofthe 7 sliow'nin Fig.V l downwardly-into operative VV"positiorfithelowermosbguard .elementi 13 ngagethefarmi? and, movie itdownf e.

Teste/Fig 34am itin turn Win-gna@ ,roch-29;?- s moved `inone*direction,orjthef` operated or ffon positionback into r neutra Afp vsit0117 andthus "Stonthe moto? 21.1 Fig. l, the brush carrying framerr` 'shown inneutral position".V It'- the Near its upper -tliatftheyare`maintainedf'in `'parallel relai?. n yltionship. By-eansing'f each 'guard'elementf-y i( Cto effect the engagement of the' nextorsuc-r` -L`ceeding guardelementu with' the screvvft' e threads looftheft-eedlscreivscorshafts, they p 1Vbf-ieeiiieuniformly'spaced,asftheypmoveinto 4operative posit-ion;VK y, "fngfmyvconstruction I'provitle a sufficient kthe:rodff24aidjovvnyvardlyiandxlthe"armi-.24522 l intoilposition to beacted fupojn; byjthe guard"y e elements lyvhen they.- yarelrlnoveydup'Wardll'yi1y e or in the; opposite direction. f-Neainitsil'floiver fendl,,therod.24a is provided vWith-[apairfofj .spaced tappets36,136a,-projectingflaterally,L. preferably in'ja direction''oppositezpto the arms 24H-24250 thatone or the other thereotwillen'gage a Vprojection 37carredgbyfff the brush-marrying" frame 23.YWhen the4 i other, yfas; just described, `itwvilllcauser-.the

brush" ,carrying frame 231e move from-V.

y n e e A trarne2,3 is ,osellatedj,.cl-ockwise, /the, projeetion will berpositionedfin thepathpyofXnoveinent7^ ot the tappet 36. y.,AccordinglyiWhenQ-thei i tappetv v6V is operated by'fpthe dovvnyvardi;v movement of gthe rod 2451,'` "it `will "n io'vey the i' `iframe 23backinto jthef Vposition Is/liovt/n .Y Fig This operation will Inove theftappet l 536 tothe position shown inlFig.-3; ,then

it' the frame 23' is oseillated to the position Y shownv in this'flastmentioned vie-vv, thelpro? 'jecton will be positioned inthe pathof-:movement of the tappetfk, so lthat when th'erguard'"elements 13 reachtheir limi'tfo movement inthe upward direction, they Willffjact throughthe arm 24h," rod4 24"?, tappetlfv` *and*V projection 37 to movey theframewfro'rnf" itsfoniposit1ontoits neutraly position, as.

shown .inf Fig. l.

` f From thetoregoingfdeSCript-ion'yit will be Seen that theguardelementsfinay be readilyA moved` from either position 'to the'lotherf" .Eofsitioin and yvliensetiill motion,theyWill "eautomatically,'stopped upon reachingthefposition towards whichyfthey aremoving-j It will also be seen'fthat by providing n Vfeed kscrevv' withwhich vthe "guard elements A f have screvvethreaded engagement,Vvthey'jniay lU01 y be propelled in either direction in a'poffai-k.tivemanner; Furthernioray ,this construe; e tion'servesj 'to lock theguard yelements against movement along the feed screw,

the guardelements at: the saine` speed so numberof guard.' elements-'sothat ivhelifitheyie .are-fpositioned to, guard the .QpenifngQg the-fiVatlpnints:between v the i side edges: o, 'Y i ngq/feutilize themitssupplhentzilignerdl' rlgopenin'gs' v-trtive and erenot;1r intended to'be in' tati'nf e 2i In apparatus of therohiss described, the

spacesaebetween themn'n will:V .beef es size: to"Y fromentering?betweenv' `infsaid chamber'forengaged Wit-h the threads of sadscrew threaded' sections,v whereby prevenif n: pers them;N y Byi speenthe Iconnecting; devices? fillus. any' and' thel diselosures .herein|are purel) isenselimitingi, j VVhnt-eleann is:

` Vl: In apparatus() having sereivL'tli'ife-ntled seCtion"extendingV'freni endi to end 'of the`l Openingfend un 'untlireaidedJv sectionezending Hintoj' said' chamber;agplnrality 'of guurdfeiements hnvj ingserenf threaded openings 'slidzibly fitting the@ v` u'ntlirend'ed1sections ot'f` said shafts whereby 'they may be; v nested in'4veonipnet/ relati'onship fin` saidehfiinber' withy the th'reidsfot'-snidsere"\ threaded sectio'nsgfwhfereby' they may be propelled int o1rative positioinrlendmeansfor/r0- Combination withV i frame- Workforming 'an opening ande ehninberntene' endet the opening ot` a'pur ofvrshats disposednt opposite sides of said opening', each shatt. having n'screw threaded section extendingw vfrom end to en'dmoffthe opening andan Unthreaded section extending; into said y chamber, 2t plurality ofguard elementshav` their,movement in. 'oneI direetion. Y

3;A ln nppnratusbf the class de ser1bed,1the yc:on'ibinzitvioii withAeyfrnine Work forming`- ing iserew threaded openings slidably rit,`

` ting the-Unthreaded seetionsfot 4seidv Shetts whereby they may benested' in Vcompnet relationship 1n vsaid chambern on engaged with thethreads of said Soren' threaded i sections, whereby they mayV bevpropelled intooperative positionymea-ns fior rotating said shafts,endfmeans for .stopping the rotation of Athe shaft Whensaid gunrd ele-1ments reach n. predetermined position in nopening andr a ehnmbernt oneY:endl of the opening` oi :i-Qairl'o shafts dlsposedat opposite ,sldesvof ,said -opeinngg V eaeh shafty `hevinfr e screwthreadedf sectionvextendin 1 threaded section extendingvinto snid'eham'* bergil'eplurility of guard elements having if "giro theolasstldeseribed,` the"lcombination Withderrame* :Work torining an A unthreajded i 'seetion'svot:` said shafts? whereby.'

they-may be" nestedineompact :relationship .f

theyimuy",befpropelled .into operative posi-A tion,'v means forvrotating" said shafts; fnndl-f in either4 direetionfr I el. iin*A.apparatus o'flth'efelass described, the" i eon'ibin'ntion With aiframeworktormin'gaif threadedfseetion extendinginte' i said ehnml her;nl plurality" eign-ardeleientsf` having" threaded openlngs'rshdbly'fitting-the\y unt ser-mv threaded seetion'S,-A -Wh'erebiIVA they may bepropelled into operativepsif tion',`f1iienns for rotatingsaidsihiftsinnd vineens tor feeding sald'fgu'irdl elements Asueeessivelyinto engagement with' the screw combination Withe frame Werk forming; an"l posite v sides 01"' said? opening,A each shaft hav-V ing n screwthreadedA section extending from end rto end ,et the' 'opening land anUnthreaded sectiony extend-ing into vsaid chamber7 n plurndityfotyguzird elements 4having screw threaded open-ringsslrdnbly fitting" the"uni they nitty. benested in' 'compactrelationshipvw in seid ehninbe'rfoi engaged 'with the th'ren'dsf yI o'tsaid serew'threa'ded sections,Wherebyth'ey may be propelledT into operative'v position;

,ineens toiifot'ating'snid shafts, and-'means tot feeding lsind guardelements successively into engagement f with the fserewf threads'v oftioijied -ni'eansrcomprising' devices for releasnbly`l'iolcling sindelements in sn'idchninber isnid-serewthreaded sections," said-flstimenand connections between? said elements' oper# f nt'ing-'toetfeettheir vrelease from sniddeviees successively, i Y

6; In'npparatusof the class described, the the 'combination ot zi trameworltormingen euch shnft'fhnving" 'a 4screw' threaded section4entt-indin'n't om 'end to endet the opening end nn u'nthreeded;sectionextending beyond" 'one-end thereoifgn plurality-o1"- guard ele-"'mentsha'vingiserew threaded ogeningsy slid? able dnltheun threaded'sections of saidfshafts- Vand niriniged toengug'e the threaded sections1 whereby said elements 'areapropelledorf' y moved across said openingtofform aguard" l therefor, devices for releasably holding said..elements iii nested yrelationship along;` the und-.

, nectionsbetween"saidjelements operating to. fieect disengagement*thereof 'from f holding'means oneafter another as they are #fedacrosssaidopeningj o l threadedV sections of said. shafts',` and con- 7;In apparatusof kthe class described, theY combination4- of p a4 v:framework forming -y an 'openingto be guarded, a Vpair of shafts dis-`1posed',` along opposite'sides offsaid opening,

and arranged tio .engage `the threaded sections thereof, vmeansy for@rotating said .shafts wherebyV said elem'entsv are propelled or li'moved-across said, opening toform a guard therefor, 'a pair lof:yieldable devices 'for reg leasedlyy xholding said elements in` nested.re-

ilatio'nship yalongthe unthreaded sections of saidf'shafts, andAconnections between said elements operating to effect disengagementthereof fromfsaidholding means one-after.

another as they are 'fed' 4across `said opening.

- combination; of? a vframe' .work forming an `opening tro-ble guarded,ay pair of shafts dis# osedlfalong. of aosite sides of said o enineach.v shaft having a screw threaded section extending from end to endfof the openingk and an unthreaded section extending beyond one endthereof, a plurality of guard eleinentsliaving screw threaded 'openingsslid? able on the unthreaded sections of said shafts and arranged toengage the threaded sec--v tions thereof, means for rotating said shaftsVwhereby said elements are lpropelled or moved lacross said opening toform ahguard therefor, devices Vfor releasably holdingY said elementsinnested relationship along the ulithreaded sections of said shafts, andfoldi vableliiilrsbetween said elements operating combinationwithaframe-work forming an rtofifeffect disengagement thereof fromv said I fholding meanspone after anotheras they'` are fed acro'sss'aid opening.'`l n V9. VIn apparatusof the classdescribed, the

'openingand a chamber at one end thereof, of

a pair of feed screwsdisposed at opposite) sides of said opening andextending from end to end thereof, a plurality of guard elle ments,havingy 'screw threaded engagement at ytheir opposite ends Vwith saidfeed screws,

means forfrotating said feed screwstojmove v. said guard'elements intoVoperative relation to said `openingto guard it or intosaid i chamber,connections' between said guard elements, and, meansin saidfchambercofactingwith said eonnectonsto control vthe dei said liverybf saidelements tothethreads i of .said

feed Jscrews, 1 whereby said :len'ients `are unifoirinlyl spaced alongsaid feed screws when t moved intoy guarding possitioii. j rv` a-iiopening',yof an auxiliary frame fitting"k said opening and co-operating.with@ said Y ,c frame-,work to' formv a chamberfat one end thereoffapair of feed screws disposed at opposite sidesfof said openingand'extending vfrom end to end thereof, 'a plurality of guard elementshaving screw threaded engagement at their oppositeV ends `with `saidfeed screws,

means for rotating saidffeed screwstto move :said-guard elements intooperative:relation to said opening to guard it' oiffpintdsaid chamber,connections between saidA guard elements, and means insaidchamberico-acting with said connectionsto control-y the de-V livery ofsaid elements to the theadsof vsaid feed screws, whereby said elementsarefiini- 4formly spaced along said yfeed-screws `when movedintoguarding'position. i

. 11. In apparatus of theV class described,

the combination withv alframeworkforming an opening,of av cross member'at onelendof said opening and cosoperating:y witlif isaid framework toform a` chamber, .alpair of l VVVfeed screws disposed atzopposite sides`offfsaid g 8. In apparatus of the class described, the

opening-and extending from end' 4tofend thereof, a vplurality ofguard-elements #having screwy threaded .engagement at 'theirs op-Vposite ends with? said. feedscrewsmeansifor rotating said feed'screwstomove said guard elements into operative rela-tion to said opening toguard it'or intosaid chamber,

connections between said guard elements, Y

and means in said chamber coacting with l'said connections to controlthe delivery of y ioof the combination with'a frame-,work forming i nan'openingy to beguarded, anda chamber at' one end thereof, of a pair offeedfscrews dis? Y posed at opposite sides of said opening andi;

extending from end to end thereojha plu- Lrality of", guard elementshaving screw threaded engagement at their opposite' vends with said feedscrews, means for rotating said feed screws to move said elements intoopera-y tive'relation to said opening tof guard it or(r` into saidchamber, and spaced connections.; between said elements serving torestrict the Y spaces between them. 'f n' Y y 13. In apparatus of theclass described,

the combinationwitha framework forming an opening to be guarded, and akchamber-at one end thereof, of Aapair of feed screweidisposed atopfposte sides of said openingy and eXtendin i rom end to end thereof, ay'plus -fiility yo guard elements "having screw' threads `of said-,feedscrevvsjvvhen being -moved into position i to guard saidl opening.

.14. In apparatus of the class described, the

combination with `a framework forming an opening.v to1 ,heV guarded, anda;k chamber; at one lend thereof, ofza pair. of feed :screw-s disposedat- .k opposite Vsides -of'said opening and `eX-r tending 'from endl toeiidf thereof, .al plurality ofguard elenientsiliaving screw threaded.en#

fgagement at their ,opposite len-ds With said `feed screws, means forrotating. said :f'feed screwsftomove saidielements into operativerelation-'to said opening to guard :it vor into said-chamber, vmeans forcontrolling the de- :liiveryofasaid `Velements from said chamber .tintoeng-agement :with the threads of said feed screws When-being moved intoposition l1?? to gua-rd said Opening, and y.means .for stopping saidlrotating means when said guard .elements reach a predetermined'position.

durii'ig movement lin.. either direction; Y

@15.In Yapparatus of the class-described,

`7 'v the'- combination Withaframe work forming .an opening toi-begiiarded,.ofa pairof isup- ,port-ing devices arrangeda-long two` sidesof -thexopening -gii-ardelements ,supported lat their opposite; endsvonf said 'devices and arspaced relationship.

lfixed `my signature.

1 desd-,1:34

..ranged. gto 'loe 4disposed finvnested relation.at

one .side :of the opening, means operating.. to

-suceessively engage said elements :in their :nested position and moveeacli relative tothe vadjacent.element into vspaced relation thereto andto-move all'of the.: elements so engaged land fspacedfaloiig saiddevices to arrange '..t-hem7in operative relation to thezopeninv, saidmeans comprising screw-threads oii saidy supporting devicesittingithreaded openings v formed .in the opposite ends of said .ele--ments,;and.-means serviiigzto space sa'id'elements relative to .eachother as 'they are :moved from.v a .nestedrelationship into 16.Inapparatu-sof the class described, -t-he, combination with a frame4Work forming an openingtobe guarded, -ofalpluralityvof ,gua-rdeleinentsdisposed :transversely of said opening and arranged to,henestedzat one jside. thereofi means yfor support-ing the oppositerends of said devices in 'iiestedjirelation 'and for moving them.successively Afrom/their y.nested-,rela tion relative to the opening,:and

means cos-.operating with .the movingyele- Y nientsof the last mentionedmeans .foref- -.feeting and controlling the successive movement .of saidguard .elements lto uniformly space the :latter when engaged by the`moving elements. of` said supporting and .moving means:

'Intestimony whereof, I have :hereunto af- AALGUIN nQKiN'rNi'in.

